Pace Yourself: Intraindividual Variability in Context Use Revealed by Self-paced Event-related Brain Potentials

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Neuroimaging

Background:

• Event-related brain potentials (ERPs) demonstrate how context influences language processing.
• Limited research exists on the trial-to-trial variability of context use in the brain.

Purpose of the Study:

• To investigate intraindividual variability in behavioral and neural measures of context processing during reading.
• To explore the dynamics of semantic prediction and cognitive control during sentence comprehension.

Main Methods:

• Utilized a concurrent self-paced reading and ERP paradigm.
• Participants read sentences with varying contextual constraints (strong/weak) and target word predictability (expected/unexpected).

Main Results:

• Observed significant within-subject variability in responses to contextual constraints.
• N400 amplitude reductions correlated with slower reaction times (RTs).
• Prediction violations showed a skewed RT distribution; faster violations elicited a late anterior positivity, while slower violations revealed an earlier anterior N2 effect linked to cognitive control.

Conclusions:

• Context use in reading exhibits substantial individual variability.
• Cognitive control mechanisms play a direct role in the volitional control of reading.
• Integrating behavioral and neural data provides insights into single-item processing dynamics.